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// SPDX-License-Identifier: GPL-3.0-only
// SPDX-FileCopyrightText: 2026 Project Tick
// SPDX-FileContributor: Project Tick Team
/*
* ProjT Launcher - Minecraft Launcher
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* === Upstream License Block (Do Not Modify) ==============================
*
*
*
* Prism Launcher - Minecraft Launcher
* Copyright (c) 2023 Trial97 <alexandru.tripon97@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ======================================================================== */
#include "SkinModel.h"
#include <QFileInfo>
#include <QPainter>
#include "FileSystem.h"
#include "Json.h"
static QImage improveSkin(QImage skin)
{
int height = skin.height();
int width = skin.width();
if (width != 64 || (height != 32 && height != 64))
{
return skin;
}
// It seems some older skins may use this format, which can't be drawn onto
// https://github.com/PrismLauncher/PrismLauncher/issues/4032
// https://doc.qt.io/qt-6/qpainter.html#begin
if (skin.format() <= QImage::Format_Indexed8 || !skin.hasAlphaChannel())
{
skin = skin.convertToFormat(QImage::Format_ARGB32);
}
if (skin.size() == QSize(64, 32))
{
// old format
auto newSkin = QImage(QSize(64, 64), skin.format());
newSkin.fill(Qt::transparent);
QPainter p(&newSkin);
p.drawImage(QPoint(0, 0), skin.copy(QRect(0, 0, 64, 32))); // copy head
auto leg = skin.copy(QRect(0, 16, 16, 16));
p.drawImage(QPoint(16, 48), leg); // copy leg
auto arm = skin.copy(QRect(40, 16, 16, 16));
p.drawImage(QPoint(32, 48), arm); // copy arm
return newSkin;
}
return skin;
}
static QImage getSkin(const QString path)
{
return improveSkin(QImage(path));
}
static QImage generatePreviews(QImage texture, bool slim)
{
QImage preview(36, 36, QImage::Format_ARGB32);
preview.fill(Qt::transparent);
QPainter paint(&preview);
// head
paint.drawImage(4, 2, texture.copy(8, 8, 8, 8));
paint.drawImage(4, 2, texture.copy(40, 8, 8, 8));
// torso
paint.drawImage(4, 10, texture.copy(20, 20, 8, 12));
paint.drawImage(4, 10, texture.copy(20, 36, 8, 12));
// right leg
paint.drawImage(4, 22, texture.copy(4, 20, 4, 12));
paint.drawImage(4, 22, texture.copy(4, 36, 4, 12));
// left leg
paint.drawImage(8, 22, texture.copy(4, 52, 4, 12));
paint.drawImage(8, 22, texture.copy(20, 52, 4, 12));
auto armWidth = slim ? 3 : 4;
auto armPosX = slim ? 1 : 0;
// right arm
paint.drawImage(armPosX, 10, texture.copy(44, 20, armWidth, 12));
paint.drawImage(armPosX, 10, texture.copy(44, 36, armWidth, 12));
// left arm
paint.drawImage(12, 10, texture.copy(36, 52, armWidth, 12));
paint.drawImage(12, 10, texture.copy(52, 52, armWidth, 12));
// back
// head
paint.drawImage(24, 2, texture.copy(24, 8, 8, 8));
paint.drawImage(24, 2, texture.copy(56, 8, 8, 8));
// torso
paint.drawImage(24, 10, texture.copy(32, 20, 8, 12));
paint.drawImage(24, 10, texture.copy(32, 36, 8, 12));
// right leg
paint.drawImage(24, 22, texture.copy(12, 20, 4, 12));
paint.drawImage(24, 22, texture.copy(12, 36, 4, 12));
// left leg
paint.drawImage(28, 22, texture.copy(12, 52, 4, 12));
paint.drawImage(28, 22, texture.copy(28, 52, 4, 12));
// right arm
paint.drawImage(armPosX + 20, 10, texture.copy(48 + armWidth, 20, armWidth, 12));
paint.drawImage(armPosX + 20, 10, texture.copy(48 + armWidth, 36, armWidth, 12));
// left arm
paint.drawImage(32, 10, texture.copy(40 + armWidth, 52, armWidth, 12));
paint.drawImage(32, 10, texture.copy(56 + armWidth, 52, armWidth, 12));
return preview;
}
SkinModel::SkinModel(QString path) : m_path(path), m_texture(getSkin(path)), m_model(Model::CLASSIC)
{
m_preview = generatePreviews(m_texture, false);
}
SkinModel::SkinModel(QDir skinDir, QJsonObject obj)
: m_capeId(Json::ensureString(obj, "capeId")),
m_model(Model::CLASSIC),
m_url(Json::ensureString(obj, "url"))
{
auto name = Json::ensureString(obj, "name");
if (auto model = Json::ensureString(obj, "model"); model == "SLIM")
{
m_model = Model::SLIM;
}
m_path = skinDir.absoluteFilePath(name) + ".png";
m_texture = getSkin(m_path);
m_preview = generatePreviews(m_texture, m_model == Model::SLIM);
}
QString SkinModel::name() const
{
return QFileInfo(m_path).completeBaseName();
}
bool SkinModel::rename(QString newName)
{
auto info = QFileInfo(m_path);
auto new_path = FS::PathCombine(info.absolutePath(), newName + ".png");
if (QFileInfo::exists(new_path))
{
return false;
}
m_path = new_path;
return FS::move(info.absoluteFilePath(), m_path);
}
QJsonObject SkinModel::toJSON() const
{
QJsonObject obj;
obj["name"] = name();
obj["capeId"] = m_capeId;
obj["url"] = m_url;
obj["model"] = getModelString();
return obj;
}
QString SkinModel::getModelString() const
{
switch (m_model)
{
case CLASSIC: return "CLASSIC";
case SLIM: return "SLIM";
}
return {};
}
bool SkinModel::isValid() const
{
return !m_texture.isNull() && (m_texture.size().height() == 32 || m_texture.size().height() == 64)
&& m_texture.size().width() == 64;
}
void SkinModel::refresh()
{
m_texture = getSkin(m_path);
m_preview = generatePreviews(m_texture, m_model == Model::SLIM);
}
void SkinModel::setModel(Model model)
{
m_model = model;
m_preview = generatePreviews(m_texture, m_model == Model::SLIM);
}
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